Reversal preventive device

ABSTRACT

A rolling member fitted into a guide recess and capable of performing a wedge action on a collar of a rotary quill is held by an annular holder in such a manner that the longitudinal movement of the rolling member can be restricted and the outside of the annular holder is rotatably fitted with an annular outer frame for restricting the outward movement of the rolling member, thereby forming a brake main body. By rotating the annular holder by use of a rotation operation member provided in the annular holder, the rolling member is controlled such that it can be restricted and held at an operative position allowing the wedge action or at a non-operative position prohibiting the wedge action, thereby switching the rotary quill to a reversal preventive position or to a reversal allowable position. Also, the brake main body is constructed as detachable one unit.

This is a continuation of application Ser. No. 08/073,925, filed Jun. 9,1993 which was abandoned upon the filing hereof.

BACKGROUND OF THE INVENTION

The present invention relates to a reversal preventive device forpreventing the reversed rotation of a rotary shaft and, in particular,to an improved reversal preventive device applicable to a fishing reel,capable of switching a rotary shaft from its reversal preventive stateto its reversal allowable state or vice versa.

Japanese Patent Publication No. 54-141285 of Showa discloses a reversedrotation preventive device for preventing the reversed rotation of arotary shaft by use of the wedge action of a rolling member. Thereversed rotation preventive device can switch the rotary shaft of therotor from its reversal preventive state to its reversal allowable stateor vice versa according to fishing conditions.

The reversed rotation preventive device has a holder member forcircumferentially supporting therein a rolling member in such a mannerthat the rolling member can perform a wedge action in cooperationtherewith, and a switch member for holding the rolling member axially soas to prevent the removal of the rolling member from the holder memberand for restricting the rolling member to its operative positionallowing its wedge action or at its non-operative position prohibitingits wedge action. The switch member is mounted on an axial end of theholder member by utilizing mounting screws which is commonly used formounting the entire rotation preventive device onto the reel casing.Therefore, the rolling member, hold member and switch member separatelyfrom one another must be assembled to the reel casing. Also, when therotation preventive device is disassembled from the reel casing forcleaning purpose, the rolling member, holder member and switch memberare unavoidably separated from one another. Therefore, the conventionalrotation preventive device comprised of separate rolling member, holdermember and switch member are inconvenient to handle. Further, thesupporting of the rolling member by the switch member is not stable fromthe viewpoint of dimensional accuracy and supporting strength, and thusa smooth and positive wedge action cannot be maintained.

Accordingly, it is an object of the invention to provide a reversalpreventive device which can solve the above-mentioned problems found inthe conventional reversal preventive mechanism utilizing a wedge actionof a rolling member.

SUMMARY OF THE INVENTION

In order to attain the above-noted and other objects, the presentinvention provides a reverse rotation preventive device for selectivelypreventing a reversed rotation of a first member rotatably supported ona second member, which is made up of a brake unit adapted to be mountedbetween the first and second members and removable therefrom as a unitconstruction. The brake unit includes: a rolling member; a annularholder formed with a guide recess for accommodating and supporting therolling member so as to restrict an axial displacement of the rollingmember; first positioning means for biasing the rolling member toward afirst position where the rolling member is permitted to perform a wedgeaction on the first member wherein the first member is permitted torotated in a first direction and prevented from rotating in a seconddirection opposite to the first direction; and second positioning meansfor moving the rolling member, against a biasing force of the firstpositioning means, toward a second position where the rolling member isprevented from performing the wedge action wherein the first member ispermitted to rotate in both the directions.

The annular holder may be designed to be non-rotatably mounted onto thesecond member so that the rolling member in the first position performsthe wedge action between the first member and the annular holder.Alternatively, the brake unit may have an annular outer frame coupled tothe annular holder and adapted to be non-rotatably mounted onto thesecond member so that the rolling member in the first position performsthe wedge action between the first member and the annular outer frame.

Preferably, the first positioning means also functions to retain therolling member in the guide recess.

The annular holder is non-rotatably coupled to the annular outer frame.Alternatively, the annular holder may be rotatably coupled to theannular outer frame. In the latter case, the second positioning means isfixed to the annular holder so that the annular holder is rotatedrelative to the annular outer frame to move the rolling member towardthe second position.

BRIEF DESCRIPTION OF THE DRAWINGS

In the accompanying drawings:

FIG. 1 is a longitudinally sectional front view of a first embodimentaccording to the invention;

FIG. 2 is a partially cutaway section view of the first embodiment,taken along the line II--II in FIG. 1;

FIG. 3 is an exploded perspective view of main portions of the firstembodiment of the invention;

FIG. 4 is a side view showing a modification of the first embodiment;

FIG. 5 is a longitudinal front view showing another modification of thefirst embodiment;

FIG. 6 is a longitudinal front view showing yet another modification ofthe first embodiment;

FIG. 7 is a section view taken along the line VII--VII in FIG. 6;

FIG. 8 is a partially cutaway section view taken along the lineVIII--VIII in FIG. 6;

FIG. 9 is a longitudinal front view showing still another modificationof the first embodiment;

FIG. 10 is a section view taken along the line X--X in FIG. 9;

FIG. 11 is a partially cutaway section view taken along the line XI--XIin FIG. 9.

FIG. 12 is a partially cutaway section view corresponding FIG. 2,showing a further modification of the first embodiment;

FIG. 13 is a partially cutaway section view corresponding to FIG. 2,showing a still further modification of the first embodiment;

FIG. 14 is a partly cutaway front view of a second embodiment of areversal preventive device according to the invention;

FIG. 15 is a longitudinally sectional front view of main portions of thesecond embodiment shown in FIG. 14;

FIG. 16 is a partly cutaway side view of an operative position to betaken by the above main portions;

FIG. 17 is a partly cutaway side view of a non-operative position to betaken by the above main portions;

FIG. 18 is an exploded perspective view of the above main portions;

FIG. 19 is a partially cutaway side view showing a modification of thesecond embodiment;

FIG. 20 is a longitudinally sectional front view showing anothermodification of the second embodiment;

FIG. 21 is a partially cutaway plan view showing yet anothermodification of the second embodiment;

FIG. 22 is a longitudinally sectional front view showing still anothermodification of the second embodiment; and

FIG. 23 is a partially cutaway side view of FIG. 22.

DETAILED DESCRIPTION OF THE INVENTION

Preferred embodiments of the present invention will now be describedhereinafter with reference to the drawings attached hereto.

FIGS. 1-3 show a reversed rotation preventive device applied to aspinning reel for fishing, which constitutes a first embodiment of thepresent invention. In the spinning reel, as well-known, a rotor 1 isfixedly secured to a rotary quill 3 which is formed with a pinion 2meshable with a drive gear mounted on a handle shaft. The rotary quill 3is rotatably supported by a front portion of a reel casing 4 by means ofa bearing 5, and a collar 6 is non-rotatably fitted onto a portion ofthe rotary quill 3 in front of the bearing 5.

The reversed rotation preventive device according to the firstembodiment of the present invention includes a brake unit 12 which isconstructed mainly by an annular holder 9 adapted to be rotatablymounted onto the rotary quill 3 through the collar 6, an annular outerframe 10 non-rotatably and tightly fitted onto the annular holder 9, androlling members 7 held by the annular holder 9 and the annular outerframe 10. The annular holder 9 is formed with guide recesses 8 foraccommodating respective rolling members 7 therein. Each guide recess 8has an opening 8' at the bottom thereof, through which the rollingmember 7 accommodated in the guide recess 8 is partially exposed so asto contact with the collar 6 and an opposite open end 8" through whichthe rolling member 7 is permitted to contact with the inner surface ofthe annular outer frame 10 for wedge action.

A spring 11 is provided in each guide recess 8 for biasing the rollingmember 7 in an reversal preventive position where the rolling member 7can perform a wedge action between outer circumference of the collar 6and the inner surface of the annular outer frame 10. In the reversalpreventive position, the rotation of the rotary quill 3 is permittedwhen the rotary quill 3 is rotated in a direction where the rotor 3winds a fishing line onto a spool. On the other hand, if the rotaryquill 3 is going to rotate reversely, then the wedge action of therolling member 7 prevents the rotary quill 3 from rotating.

In order to prevent the rolling members 7 from falling off from thebrake unit 12 during the assembling or disassembling operation, theguide recesses 8 are configurated as follows: The opening 8' has such adimension as to permit the rolling member 7 to be circumferentiallymoved relative to the annular holder 9 within the guide recess 8 whilecontacting the collar 6 and to prevent the rolling member 7 from fallingoff from the guide recess 8 through the opening 8'. The open end 8" hassuch a dimension as to permit the insertion of the rolling member 7 intothe guide recess 8. Therefore, the axial and radially-inward motions ofthe rolling member 7 accommodated in the guide recess 8 are restrictedby the annular holder 9 and the radially-outward motions thereof isrestricted by the annular outer frame member 10 so as to prevent therolling member 7 from falling off from the brake unit 12.

Alternatively, in order to prevent the rolling members 7 from fallingoff from the brake unit 12, the spring 11 may be arranged to bias therolling member obliquely outward to retain the rolling member 7 in theguide recess 8.

Arc-shaped holes 13 are formed in the annular holder 9 so as to passesthrough the front portion of the annular hold 9 and communicate withrespective guide recesses 8 accommodating the rolling members 7. Anannular switch member 15 having an operation rod 14 is rotatably fittedonto a shaft cylinder portion 9' which projects on and from the frontportion of the annular holder 9. The switch member 15 includes operationprojection pieces 16 which are inserted into respective arc-shaped holes13 so as to be abuttable against the rolling members 7. With therotation of the operation rod 14 relative to the holder 9, each rollingmember 7 can be held at its operative position, i.e. the reversalpreventive position, which allows the rolling member 7 to perform thewedge action or at its non-operative position which prevents the rollingmember 7 from performing the wedge action.

In the drawings, reference character 17 designates an operation memberrotatably mounted on the reel casing for rotating the operation rod 14,and 18 designates a retaining ring for retaining the switch member 15fitted to the shaft cylinder portion 9' in place. Reference character Sdesignates a biasing spring which selectively hold the switch member 14through the operation member 17 at one of the operative positionallowing the wedge action and the non-operative position prohibiting thewedge action, utilizing its dead point action.

In a state where the switch member 15 is held at the operative positionwith the operation rod 14 so that the rolling member 7 is allowed toperform the wedge action, the rotary quill 3 can be rotated'to rotatethe rotor 1 in the fishing line winding direction while the reversedrotation thereof is prevented by the wedge action of the rolling member7. On the other hand, in a state where the switch member 15 is rotatedso that the operation projection piece 16 moves the rolling member 7against the biasing force of the spring 11 in the arrow-marked directionshown in FIG. 2 and holds the rolling member 7 at the non-operativeposition prohibiting the wedge action, the rotary quill 3 is free torotate forwardly and reversely and the fishing line can, thus, be reeledout by means of the tension of the fishing line itself.

In this structure, the rolling members 7, hold member 9, outer frame 10and switch member 15 are combined together in the compact brake unit 12and, therefore, the reversal preventive device of the present inventionis easy to assemble to the rotary quill 3 and is also easy to disconnecttherefrom for cleaning. Further, according to the present invention, thesupport operation for the rolling member 7 can be stabilized to therebyrealize a smooth and positive wedge action.

FIG. 4 shows a modified one of the first embodiment of the presentinvention, in which the switch member 15 is biased by a spring 19 tohold the rolling member at the operative position. A stop pin 31 isprovided to position the switch member 15 in place. An operation knob 17having a semi-cylindrical cam projection rotates the switch member 15against the biasing force of the spring 19 to position the rollingmember in the non-operative position.

FIG. 5 shows another modified one of the first embodiment, in whicharc-shaped elongated holes 20 are formed in the switch member 15, withthe arc-shaped elongated holes 20 fitted with respective pins 21projectingly provided on the outer frame 10 so that the switch member 15is rotatably mounted on the outer frame 10. The shaft cylindricalportion 9' and the retaining ring 18 in the first embodiment can bedispensed with.

FIGS. 6 to 8 show yet another modification of the reversal preventivedevice according to the first embodiment of the present invention. Theswitch member 15 is fitted onto the shaft cylinder portion 9' of theannular holder 9 so as to be axially movable relative to the annularholder 9. The operation projection piece 16 of the switch member 15 isformed into a tapered shape as best shown in FIG. 8. The switch member15 is biased by a spring 15' in such a direction where the operationprojection piece 16 is prevented from entering the guide recess 8. Theupper end of the operation rod 14 of the switch member 15 is broughtinto contact with the cam surface 17' of the operation member 17.Therefore, if the operation member 17 is rotated, then the switch member15 is driven by the cam surface 17' through the operation rod 14 toslide against the biasing force of the spring 15', so that the rollingmember 7 can be switched and restricted to the non-operative position bymeans of the tapered operation projection piece 16.

FIGS. 9 to 11 show a further modification of the first embodiment, inwhich the operation rod 14 is formed separately from the axially movableswitch member 15. The operation rod 14 is fitted onto the shaft cylinderportion 9' in such a manner that the operation rod 14 is piled on theswitch member 15 and movable vertically relative to the switch member15. An operation projection 14' is provided on the side surface of theoperation rod 14 so as to be engageable with an engagement projection15" formed on the switch member 15. The upper end of the operation rod14 is engaged with an operation member 17. When the operation member 17is rotated to move the operation rod 14 upwardly, the operationprojection 14' is brought into abutment with the engagement projection15" to depress and move the switch member 15 against the biasing forceof the spring 15', so that the rolling member 7 can be switched andrestricted to the non-operative position by the tapered operationprojection 16.

In the above-mentioned first embodiment, the reversal preventive deviceof the invention is disposed on the rotary quill having a pinion of aspinning reel for fishing. However, the present invention should not berestricted thereto or thereby. The reversal preventive device of theinvention may be disposed on a handle shaft, or on a drive shaft of adouble bearing type reel.

Further, in the above-mentioned first embodiment, the rolling member 7in the operative position performs the wedge action between the collar 6and the inner surface of the annular outer frame 10. However, thepresent invention should not be restricted thereto or thereby. Forexample, the reversal preventive device of the present invention can bemodified so that the rolling member 7 in the operation position performsthe wedge action between the collar 6 and the annular holder 9 as shownin FIG. 12.

Furthermore, the annular outer frame 10 may be dispensed with as shownin FIG. 13. In this case, the guide recess 8 has only one open end 8'through which the rolling member 7 can be inserted into the guide recess8. The spring 11 biases the rolling member 7 obliquely outward so as toprevent the rolling member 7 from falling off from the brake unit 12during the assembling or disassembling operation. The rolling member 7in the operative position can perform the wedge action between thecollar 6 and a bottom of the guide recess 8.

As has been described heretofore, according to the first embodiment ofthe invention, an annular holder accommodating and supporting a rollingmember capable of performing a wedge action is used to restrict thelongitudinal movement of the rolling member, a means for preventing therolling member from falling off from the annular hold member is providedin or on the annular holder to form a brake main unit, and a switchmember for switching and holding the rolling member at an operativeposition allowing the wedge action or at a non-operative positionprohibiting the wedge action is mounted onto one side portion of thebrake main unit in such a manner that it is rotatable or displaceableaxially. Therefore, in this structure, the rolling member, annular holdmember, outer frame and switch member are combined integrally into oneunit, which makes it quick and easy to assemble the reversal preventivedevice to the reel in production and to disconnect the device from thereel for cleaning. This structure also stabilizes smooth and securesupport operation for selectively providing the wedge action of therolling member.

Next, a second embodiment of the present invention will be describedhereinafter. FIGS. 14-18 show a reversal preventive device used in aspinning reel for fishing. In the spinning reel, as well-known, a rotor101 is fixedly secured to a rotary quill 103 provided with a pinion 102meshable with a drive gear 119 mounted on a handle shaft 118. The rotaryquill 103 is rotatably supported by the front portion of a reel casing104 through a bearing 105. A collar 106 is non-rotatably mounted on aportion of the rotary quill 103 in front of the bearing 105. Arotational torque is transmitted from the handle shaft 118 to the rotaryquill 103 through the drive gear 119 and the pinion 102 so as to rotatethe rotor 101 to wind a fishline onto a spool 131 reciprocally movingtogether with a spool shaft 132 in conjunction with the handle rotation.The spool shaft 132 passes through the rotary quill 103.

The reversed rotation preventive device according to the secondembodiment of the present invention includes a brake unit 112 which isconstructed mainly by an annular holder 109 adapted to be rotatablymounted onto the rotary quill 103 through the collar 106, an annularouter frame 110 adapted to be fixed to the reel casing 104 and rotatablyrelated to the annular holder 109, and rolling members 107 held by theannular holder 109 and the annular outer frame 110. The annular holder109 has guide recesses 108 for accommodating respective rolling members107 therein. Each guide recess 108 has an opening 108' at the bottomthereof, through which the rolling member accommodated in the guiderecess 108 is partially exposed so as to contact with the collar 106.The guide recess 108 has another opposite open end 108" through whichthe rolling member 107 is permitted to contact with the inner surface ofthe annular outer frame 110 for wedge action.

A spring 111 is provided in the guide recess 8 for biasing the rollingmember 7 in a counterclockwise direction in FIG. 16 to permit therolling member 7 to perform its wedge action on the collar 6.

With the above structure, the rotation of the rotary quill 103 isallowed if the rotary quill 103 is rotated forwardly to rotate the rotor101 to wind a fishing line onto the spool 131. If the rotary quill 103is going to rotate in the reversed direction, then the wedge action ofthe rolling member 107 prevents the reversed rotation of the rotaryquill 103 through the collar 106.

The annular holder 109 has a rotation operation member 113 which is usedto rotate the annular holder 109 relative to the annular outer frame110. The operation member 113 may be integrally formed on the holder109, or otherwise a separate operation member 113 may be fixed to theholder 109. With the rotation of the operation member 113 through anoperation rod 114 supported by the reel casing 104, the annular holder109 is rotated relative to the annular outer frame 110 to hold andrestrict the rolling member 107 to an operative position allowing awedge action as shown in FIG. 16 or to a non-operative positionprohibiting the wedge action as shown in FIG. 17. In the drawings,reference character 115 designates a withdrawal preventive piece whichis provided in the annular outer frame 110 so as to prevent the annularholder 109 from being removed from the outer frame 110 in an axialdirection, 116 designates a rotation restricting projection which isprovided in the annular hold member 109, and 117 designates a fittingrecessed portion which is formed to receive the rotation restrictingprojection 116. Reference character S designates a biasing spring whichis used to switch and selectively hold the rotation operation member 113at one of an operative position allowing the wedge action and anon-operative position prohibiting the wedge action, utilizing its deadpoint action.

Accordingly, in the state as shown in FIG. 16 in which the annularholder 109 is rotated through the rotation operation member 113 by theoperation rod 114 to restrict and hold the rolling member 107 at theoperative position allowing the wedge action, the rotary quill 103 canbe rotated in the direction to rotate the rotor 101 to wind the fishingline onto the spool, while the reversed rotation of the rotary quill 103is prevented by the wedge action of the rolling member 107. On the otherhand, in the state as shown in FIG. 16 in which the annular holder 109is rotated by the operation rod 114 to restrict and hold the rollingmember 107 at the non-operative position prohibiting the wedge action,the rotary quill 103 is free to rotate both forwardly and reversely andthus the fishing line can also be reeled out due to the tension of thefishing line.

Additionally, in order to prevent the rolling member 107 from fallingoff from the brake unit 112 when the clutch unit 112 is assembled to ordisassembled from the fishing reel, the spring 111 is also used toretain the rolling member 107 in the guide recess 108. Alternatively,the radially inward open end 118' may have such a dimension as toprevent rolling member 107 from falling off from the guide recess 108therethrough. Therefore, the axial motion of the rolling member 107 isrestricted by the annular holder 109, the radially-inward motion thereofis restricted by the annular holder 109 or the spring 111, and theradially-outward motion thereof is restricted by the annular outer framemember 110.

In the illustrated embodiment, the rolling members 107, annular holder109 and annular outer frame 110 are compactly combined together as oneunit forming the brake unit 112, which makes it easier to assemble themto the rotary quill 103 as well as to disconnect them from the quill 103for cleaning. The supporting operation of the rolling member 107 canalso be stabilized, which makes it possible for the rolling member 107to perform its wedge action smoothly and positively.

FIG. 19 shows a modification of the second embodiment, in which therotation restricting projection 116 employed in the above embodiment isformed in a pin-shaped manner and is biased toward the annular outerframe 110 by a spring 133. Engagement holes 117' and 117" are formed inan inner portion of the outer frame 110 so as to receive the roundeddistal end of the projection 116 to selectively and positively holdpositively the annular holder 109 at its operative or non-operativeposition.

FIG. 20 shows another modification, in which the brake unit 112 of thepresent invention is interposed between a drive gear 119 and reel casing104 in a spinning reel, the drive gear 119 being formed on a handleshaft 118 to rotate together.

Further, FIG. 21 shows still another modification, in which the brakeunit 112 of the present invention is interposed between a handle shaft120 and a reel main body 121 of a double bearing type reel.

FIGS. 22 and 23 show a further modification, in which the annular holder109 uses a gear-shaped rotation operation member 113, and the operationrod 114 includes a fan-shaped gear 114' meshable with the rotationoperation member 113, to rotate the annular holder 109.

As has been described heretofore, according to the second embodiment ofthe invention, the longitudinal or axial movement of a rolling membercapable of performing a wedge action on a rotary member is restricted byan annular holder which receives therein the rolling member, and theoutside of the annular holder is rotatably fitted to an annular outerframe for restricting the outward movement of the rolling member, toform a brake main unit. Further, the annular holder is rotated by arotation operation member provided thereon to restrict and hold therolling member at its operative position allowing the wedge action or atits non-operative position prohibiting the wedge action. Therefore, therolling member, annular hold member, annular outer frame can be combinedintegrally into one unit, which makes it possible to assemble them inmanufacturing and to disconnect for cleaning quickly and easily tothereby improve an operationability, and also makes it possible tostabilize the rolling member supporting operation as well as the wedgeaction of the rolling member, that is, the rolling member supportingoperation and the wedge action-of the rolling member can be achievedsmoothly and positively. Also, according to the invention, since theposition of the rolling member can be switched and restricted to theoperative position or to the non-operative position by rotating theannular hold member directly by the rotational operation member, anadditional switch member can be dispensed with, which makes it possibleto further simplify the unit structure of the reversal preventivedevice.

What is claimed is:
 1. A reverse rotation preventive device forselectively preventing a reverse rotation of a first member rotatablysupported on a second member in a fishing reel having a reel main bodyand a rotor, comprising:a modular brake unit adapted to be mountedbetween said first and second members such that said modular brake unitis constructed prior to assembly in said reel and is adapted forinsertion and removal from said reel main body as a unitary body, saidbrake unit including: a rolling member; an annular holder integrallyformed with a guide recess for accommodating and supporting said rollingmember and at least one sidewall extending radially so as to restrictaxial displacement of said rolling member; first positioning means forbiasing said rolling member toward a first position where said rollingmember is permitted to perform a wedge action on said first memberwherein said first member is permitted to rotate in a first directionand prevented from rotating in a second direction opposite to said firstdirection; and second positioning means for moving said rolling membertoward a second position where said rolling member is prevented fromperforming said wedge action wherein said first member is permitted torotate in both said directions.
 2. The reverse rotation preventivedevice according to claim 1, wherein said annular holder is adapted tobe non-rotatably mounted onto said second member.
 3. The reverserotation preventive device according to claim 1, wherein said rollingmember in said first position performs said wedge action between saidfirst member and said annular holder.
 4. The reverse rotation preventivedevice according to claim 1, wherein said brake unit further includes:an annular outer frame coupled to said annular holder and adapted to benon-rotatably mounted onto said second member.
 5. The reverse rotationpreventive device according to claim 4, wherein said guide recess has afirst opening for permitting said rolling member to contact with saidfirst member and a second opening opposite to said first opening forpermitting said rolling member to contact with said annular outer frame.6. The reverse rotation preventive device according to claim 5, whereinsaid rolling member in said first position performs said wedge actionbetween said first member and said annular outer frame.
 7. The reverserotation preventive device according to claim 5, wherein said firstopening has such a dimension as to prevent said rolling member fromfalling off from said annular holder therethrough.
 8. The reverserotation preventive device according to claim 5, wherein said annularouter frame prevents said rolling member from falling off from saidannular holder through said second opening when said annular outer frameis coupled to said annular holder.
 9. The reverse rotation preventivedevice according to claim 4, wherein said annular holder is rotatablerelative to said annular outer frame.
 10. The reverse rotationpreventive device according to claim 9, wherein said second positioningmeans is fixed to said annular holder to rotate said annular holderrelative to said annular outer frame to thereby move said rolling membertoward said second position.
 11. The reverse rotation preventive deviceaccording to claim 1, wherein said first positioning means alsofunctions to retain said rolling member in said guide recess.
 12. Thereverse rotation preventive device according to claim 1, wherein saidannular holder is integrally formed with two sidewalls extendingradially at opposite sides of said rolling member so as to restrictaxial displacement of said rolling member.
 13. A reverse rotationpreventive device for selectively preventing a reverse rotation of afirst member rotatably supported on a second member, comprising:a brakeunit adapted to be mounted between said first and second members andremovable therefrom, said brake unit including: a rolling member; anannular holder integrally formed with a guide recess for accommodatingand supporting said rolling member and two sidewalls extending radiallyat opposite sides of said rolling member so as to restrict axialdisplacement of said rolling member, said guide recess having a firstopening for permitting said rolling member to contact with said firstmember and a second opening opposite to said first opening; an annularouter frame coupled to said annular holder for preventing said rollingmember from falling off from said annular holder through said secondopening, said rolling member being permitted to contact with saidannular outer frame through said second opening; relative rotationrestricting means for restricting a relative rotation of said annularholder with respect to said annular outer frame, and comprising aprojection fixed with respect to one of said annular holder and saidannular outer frame and a recess formed on the other of said annularholder and said annular outer frame, wherein said projection is receivedin said recess to prevent said relative rotation; and switch means forselectively switching said rolling member between a first position wheresaid rolling member is permitted to perform a wedge action incooperation with said first member and said annular outer frame andwherein said first member is permitted to rotate in a first directionand prevented from rotating in a second direction opposite from saidfirst direction, and a second position where said rolling member isprevented from performing said wedge action and wherein said firstmember is permitted to rotate in both said directions.
 14. The reverserotation preventive device according to claim 13, wherein said firstopening has such a dimension so as to prevent said rolling member fromfalling off from said annular holder therethrough.
 15. The reverserotation preventive device according to claim 13, wherein said brakeunit further includes a spring means provided in said guide recess forbiasing said rolling member so as to prevent said rolling member fromfalling off from said annular holder through said first opening.
 16. Thereverse rotation preventive device according to claim 13, wherein saidannular holder and said annular outer frame are mutually rotatable. 17.The reverse rotation preventive device according to claim 13, whereinsaid annular outer frame is non-rotatably coupled to said annularholder.
 18. A fishing reel having a reverse rotation preventive devicefor selectively preventing a reverse rotation of a rotor memberrotatably supported on reel main body, comprising:a modular brake unitadapted to be mounted between said rotor member and said reel main bodysuch that said modular brake unit is constructed prior to assembly insaid reel and is adapted for insertion and removal from said reel mainbody as a unitary body, said modular brake unit including: a rollingmember; an annular holder integrally formed with a guide recess foraccommodating and supporting said rolling member and two sidewallsextending radially at opposite sides of said rolling member so as torestrict axial displacement of said rolling member; first positioningmeans for biasing said rolling member toward a first position where saidrolling member is permitted to perform a wedge action on said rotormember wherein said rotor member is permitted to rotate in a firstdirection and prevented from rotating in a second direction opposite tosaid first direction; and second positioning means for moving saidrolling member toward a second position where said rolling member isprevented from performing said wedge action wherein said rotor member ispermitted to rotate in both said directions.
 19. The fishing reelaccording to claim 18, further comprising a relative rotationrestricting means for limiting a relative rotation of said annularholder with respect to said reel main body, and comprising a projectionfixed with respect to one of said rotor member and said reel main bodyand a recess formed on the other of said rotor member and said reel mainbody, wherein said projection is received in said recess to limit saidrelative rotation.
 20. The fishing reel according to claim 18, whereinsaid rotor member comprises a rotor quill for delivering a driving forcefrom a handle shaft to a rotor adapted to receive fishline woundthereon.
 21. The fishing reel according to claim 18, further comprisingan annular outer frame is fixed to said reel main body at a positionradially outside said annular holder and adapted to contact said rollingmember.
 22. The fishing reel according to claim 21, wherein said guiderecess has first opening for permitting said rolling member to contactwith said rotor member and a second opening opposite to said firstopening for permitting said rolling member to contact with said annularouter frame.
 23. The fishing reel according to claim 22, wherein saidfirst opening is smaller than said rolling member such that said rollingmember is unable to pass through said first opening.
 24. The fishingreel according to claim 18, wherein said second positioning means isfixed to said annular holder to rotate said annular holder relative tosaid reel main body to thereby move said rolling member toward saidsecond position.